Yes, I understand what you’re saying, metric are thing that can have kilo- milli- centi- and all this, but imperials are 1 foot, 1 inch, 1 mile. The thing is that I don’t know why they called PS metric horsepower, I don’t even think you can add kilo- milli- centi- either, (you can check that﻿ it is called metric horsepower on the internet). Does that mean that there’s an imperial horsepower? Yes. it’s the normal HP we know = 745.7 kW. I also don’t really know the difference between BHP and HP…